Process for the production of coumarin derivatives



United States Patent 3,541,097 PROCESS FOR THE PRODUCTION OF COUMARIN DERIVATIVES Rudi Beyerle, Bruchkobel, Kreis Hanau, and Adolf Stachel,

Rolf-Eberhard Nitz, and Klaus Resag, Frankfurt am Main-Fechenheim, Germany, assignors to Cassella Farbwerke Mainkur Aktiengesellschaft, Frankfurt am Main- Fechenheim, Germany, a company of Germany No Drawing. Filed Jan. 2, 1968, Ser. No. 694,864

Claims priority, application Germany, Jan. 7, 1967,

C 41,146; Nov. 3, 1967, C 43,731

Int. Cl. (107d 51/70 US. Cl. 260-268 9 Claims ABSTRACT OF THE DISCLOSURE This disclosure describes new and useful pharmaceutical products particularly useful as coronary dilators and methods for their preparation. They can be designated as coumarin derivatives having the formula wherein R stands for hydrogen, allyl, lower alkyl, dialkylaminoalkyl, where alkyl in each case contains 1-4 carbon atoms, and whereby the alkyl groups attached to the nitrogen form a piperidine ring, R stands for hydrogen, lower alkyl or phenyl, and A, and A are straight or branched alkylene residues having 2-4 carbon atoms, and Y is hydrogen, a hydroxy group or the residue (R3) in and R stands for lower alkoxy where the alkyl contains 1-4 carbon atoms, and mi represents the integer 1, 2 or 3.

The present invention relates to new pharmacologically valuable coumarin derivatives and processes for their manufacture. These new coumarin derivatives have the general formula wherein R means hydrogen, lower alkyl, allyl, dialkylaminoalkyl where the alkyl contains 14 carbon atoms, and whereby the alkyl groups attached to the nitrogen atom may form a piperidine ring, R stands for hydrogen, lower alkyl or phenyl, R stands for lower alkoxy where the alkyl contains 1-4 carbon atoms, he represents the integer 1, 2 or 3, A and A are straight or branched alkylene residues having 2-4 carbon atoms and Y is hydrogen, a hydroxy group or the-residue The new coumarin derivatives are obtained- (a) By acylating, possibly in the presence of an acidbinding agent, coumarin derivatives of the general formula 3,541,097 Patented Nov. 17, 1970 wherein X stands for hydrogen or a hydroxy group, with an alkoxy benzoic acid of the general formula or with a functional derivative of this acid, or

(b) By condensing, possibly in the presence of an acidbinding agent, coumarin derivatives of the general formula HN N-Ar-O O O X with an alkoxy benzoic acid haloalkyl ester of the general formula Hal-A2000 wherein Hal stands for a halogen atom, or

(o) By reacting, possibly in the presence of an acidbinding agent, 7-hydroxy-coumarin derivatives of the general formula with a piperazine derivative of the general formula N-fir-Hal Y wherein Hal stands for a halogen atom, or

(d) By reacting coumarin derivatives of the general formula wherein Hal stands for a halogen atom, with an alkali metal salt of an alkoxy benzoic acid of the general formula HOOC are used. If diesters are prepared, the esterification may also be done in two steps, whereby in either step various alkoxy benzoic acids or their functional derivatives may be used as acylating agents. This technique permits the preparation of mixed diesters that contain two different acyl radicals. Also process of the present invention yields both the corresponding mono and diesters which is dependent upon the meaning of the substituent Y in the piperazine derivative used as starting material. When operating according to the condensation process (b) and to process (d) of the present invention, only monoesters are obtainable, which, however, may also be converted into diesters according to the esterification process (a) by means of a second mol of the acylating agent, provided the intermediate member A contains a hydroxy group capable of acylation.

The coumarin derivatives of the present invention are the coronary venous blood. This oxygen tension was measured according to polarographic methods by means of a platin electrode of the Gleichmann-Liibbers type (see U. Gleichmann and D. W. Liibbers Die Messung des Sauerstotfdruckes in Gasen und Fliissigkeiten mit der Platin-Elektrode unter besonderer Beriicksichtigung der Messung im Blut, Pfliigers Arch. 271, 431455 (1960)). The heart rate was continuously measured by electronic methods from systolic peaks of the arterial blood pressure. The arterial blood pressure was measured in the known manner in the femoral artery with the aid of an electromanometer of the Stratham-straingauge type.

The following table gives the results of the pharmacological investigations which were carried through. The preparations were tested in the form of their respective dihydrochlorides:

Maximal increase in oxygen tension Maximal change in the coronary Maximal change in the veinous blood in the heart rate blood pressure Dosage, rug/kg, In In In In In In Preparation i.v percent; minutes percent minutes percent minutes 4-methyl- 7-{3-[4-(13-3,4,5-trimethoxybenzoxyethyl)-piperazino[1]]-ethoxy 1. 0 +82 20 +30 19 (.Ollllltll'll'l. 4 methyl-7-(B-[4'-( -3,4 ,5trimethoxybenzoxypropyl)-piperazino[1]]-eth0xy 2. 0 +58 100 +16 40 coumarin. 4-methyl-7-[B-[4-(B-3,4,5-trimethoxybenzoxypropyl)-piperazino[1]]-ethoxy1- 2 0 +130 45 22 45 -31 45 coumarin. 3-mbutyl-4-methyl-7-lfi-[4-(B-3,4",5-trimcthoxybcnzoxyethyl)piperazine 2. 0 +87 30 +2 17 [I'Hethoxy i-eoumarin. 3-n-butyl-4-methyl-7-{6*[4 (Ii-3 ,4 ,5 -trimethoxybenzoxypropyl)piperazino 2. 0 +76 00 24 60 0 3 [1]]-ethoxy l-eoumarin. 3-n-butyl-4-n-propyl-7-{ 'y-[4'-(fl-3",4" ,5 -t.rimetl1oxybenzoxyethyD-piperazino 1. 0 +52 20 11 20 -23 [1]]-pr0poxy l-eoumarin. 3-ethyl4-phenyl-7- -[4-(B-3,4,5"-trimethoxyben1oxyetl1yl)-plperazino 2. 0 +80 60 +2 3 [1']]-propoxy l-coumurin. 3-ethyl-4-pl1enyl-7 l'y-[4-(B3",4,5"-tr1metl1oxybenz0xypropyl)-p1peraz1no 2. 0 +14 40 +8 10 --24 40 [1]] propoxy l-coumarin. 3-allyl-4-metl1yl-7-1'y-[4'-(B-3",4",5-trimcthexybenzoxyethyl)-piperazino[l]]- 2. 0 +41 41 22 4O 40 40 propoxy l-coumarin. 3-al1yl-4-methyl-7-l' -[4'-( S-3,4",5-trimetl1oxybenzoxypropyl)-piperazino[1]]- 2. 0 +56 40 -41 30 38 40 propoxy keoumarin. 4- methyl-7- l 'Y-l4-(B3 ,4 ,5 -trlimethoxybenzoxypropyl) -pzperaz1no-[1']]-fl3 2. 0 +44 12 16 -19 2 4",5"-trimethoxybenzoxypropoxy l-eoumarin. 3-n-butyl-4-n-propyl-7-l 'y-[4"(6-3,4,5-trimethoxybenzoxyethyl)-piperazino 2. 0 +57 34 30 32 30 [1 ]]B-3 ,4 ,5"-trirmethoxybenzoxypropoxy l-coumarin. 3-ethyl-4-phenyl-7-{ -[4-(6-3,4",5"trimethoxybenzoxypropyl)-piperazino[1']]- 2. 0 +58 -14 40 26 40 -3,4 -trimethoxybenzoxypropoxy}-eou.marin. & 3-allyl-4-.methy1-7-1v-[a (03,4,5"-trimethoxybenzoxyethyl)-piperazino[1]]- 2. 0 +91 30 -16 50 2G 5-3" ,4 ,5 "trimethoxybenzoxypropoxy -coumarin. 3-allyl-4-methyl-7-l 'y-[4'-(B-3" ,4 ,5 -trimetl1oxybenzoxypropyl)-pipcrazin0[1']]- 2. 0 +49 35 -0 35 -30 40 13-3",4",5-trimethoxybenzoxypropoxylcoumarin. 3-fl-diethylamino-ethyl-4-methyl-7-I' -[4-('y-3,4,5"-trimeth0xybenzoxypropyl)- 2. 0 +70 30 +15 30 10 5 pi erazino[1]]-6-3,4,5"-trimethoxybenzoxypropoxyl-coumarin. 3-fliethylamina-ethyl-4-methyl-7-1 -[4-(;8-3",4",5"-trimethoxybenzoxypropyD- 2.0 +94 35 10 40 -40 10 pi erazino[1]]-fl-3",4",5-trimethoxybenzoxypropoxyl-coumarin. 3-13- iethylamino-ethyM'methyH-t -[4-(- -3,4",5-trimethoxybenzoxybutyD- 2.0 +90 30 7 30 -21 20 piperazinollH-B-Zi ,4 ,5-trimethoxybenzoxypropoxy l-coumarin. 3fl-N-piperidino-ethyl-4-n-propyl-7-[ -[440-3",4,5-trimethoxybenzoxyethyD- 2. 0 +116 40 11 10 35 5 piperazine-[1]]49-3,4",5"-trimethoxybenzoxypropoxyi-eoumarin. 3-B-N-piperidino-ethyl-4-n-propyl-7-1y-[4-( -3,4,5"-trimethoxybenzpxypro- 2. 0 +48 30 +8 3 -23 10 pyl)-piperazino[1{]-;9-3 4,5trimethoxybenzoxypropoxy}coumar1n. A 3-n-butyl4-n-propy -7-{- 4-(fi-3,4",5"-trimethoxybenzoxypropyD-piperazlno 2.0 +76 40 14 40 24 40 {1]]-B-3" ,4 ,5"-trirnethoxybenzoxypropoxyl-eoumarin. 3-n-butyl-4-n-propy1-7-( (4-( -3",4",5"-trimethoxybenzoxybutyl)-p1perazin0 1. 0 +50 52 10 valuable pharmaceutics. :In particular they are excellent coronary dilators and, in this respect, superior to other known substances having such properties. Their salts are colorless, crystalline substances that easily dissolve in water.

With repect to the change in the oxygen tension in the coronary venous blood, the pharmacological investigation of the vasodilator action on the coronary vessels was carried out in dogs according to the methods described by W. K. A. Shaper and his co-workers (see W. K. A. Schaper, R. Xhonneux and I. M. Bogaard Uber die kontinuierliche Messung des Sauerstoffdrucks im ven'o'sen Coronarblut, Naunyn-Schmiedebergs Arch. exp. Path. u. Pharmak. 245, 383-389 (1963)). The test preparations were applied intravenously to the narcotized and spontaneously breathing animals. On these test conditions the dilatation of the coronary arteries caused by the test substances along with the increase in the coronary blood flow led to an increase in the oxygen tension in In the preparation of drage'es and tablets containing as essential active ingredient the coumarin derivatives of our invention, these substances may be admixed with the conventional solid tabletting adjuvants, such as starch, lactose, talc and the like. Any of the tabletting materials and carriers customary in pharmaceutical practice may be employed.

For the preparation of the injection solutions the hydrochlorides of the coumarin derivatives are particularly suited since they have mostly a good water-solubility. Injection solutions of water-insoluble products may of course be prepared in the conventional manner by concurrently using well-known suspending agents, emulsifiers and/ or solu'bilizers.

For a better understanding of the nature and the objects of this invention, reference should be made to the accompanying examples which are of an illustrative rather than a limiting nature. Unless otherwise stated, all temperatures given are in degrees centigrade.

EXAMPLE 1 droxypropyl) -piperazino[ 1] ]-ethoxy} -coumarin dihydrochloride are suspended in 500 cc. anhydrous benzene. After the addition of 30,3 g. (0.3 mol) triethylamine, a solution of 23 g. (0.1 mol) 3,4,5-trimethoxybenzoyl chloride in 100 cc. anhydrous benzene is added dropwise with stirring. Stirring is continued for 34 hours at room temperature and then for 1-2 hours with boiling under reflux and, while hot, separated triethylamine hydrochloride is filtered off with suction. The filtrate is washed with water, a aqueous sodium hydrogen carbonate solution and again with water. The benzene solution so purified is dried over anhydrous sodium sulfate and evaporated to dryness at 50 in the Water-jet vacuum. The residue, a viscous, light yellow oil, is dissolved in 1,000 cc. anhydrous diethyl ether, the ethereal solution is filtered and the dihydrochloride of the 3-n-buty-4-methyl-7-{ fi-[4-('y- 3",4",5" trimethoxy-benzoxypropyl) piperazino[1']]- ethoxy}-coumarin is precipitated with ethereal hydrochloric acid. This dihydrochloride is obtained in the form of colorless crystals decomposing at 235-237.

Yield: 52-54 g.=77-80% of the theoretical.

The 3-n-butyl-4-methyl-7-{B-[4' ('y-hydroxy-propyD- piperazinofl]]-ethoxy}-coumarin used as starting material can be prepared as follows:

(a) 23.2 g. (0.1 mol) 3-n-butyl-4-methyl-7-hydroxycoumarin are dissolved in 280 cc. dimethyl sulfoxide and admixed with 11.2 g. (0.1 mol) potassium'tertiary-butylate. This solution is stirred at 40 for minutes. With stirring, g. (0.106 mol) p-chloroethyl p-toluene-sulfonate are allowed to drop into the solution. Subsequently, stirring is done at 40 for 10 hours and the reaction mixture is poured into water. The crude product precipitating in the form of an oil is dissolved in ethyl acetate and, for further purification, Washed with dilute caustic soda solution and dried. After evaporating the ethyl acetate solution to dryness, the 3-nbutyl-4-methy1-7-B-chloro-ethoxycoumarin is obtained in the form of white crystals melting at 80-81.

Yield: 23 g.=78% of the theoretical.

Analogously, 4-methyl-7 B chloro-ethoxy-coumarin melting at 117-118 and 3-B-diethylamino-ethyl-4-methyl- 7-fl-chloro-ethoxy-coumarin melting at 106 are obtained.

(b) 29.4 g. (0.1 mol) 3-n-butyl-4methyl-7413-chloroethoxy-coumarin and 14.4 g. (0.1 mol) N-(y-hydroxypropyl)pipera-zine are dissolved in 150 cc. chloro benzene, 10. 6 g. (0.1 mol) anhydrous sodium carbonate are added and the reaction mixture is then stirred at for 12 hours. After cooling down, separated sodium chloride is filtered off with suction. The filtrate is evaporated to dryness in the water-jet vacuum and the remaining crude product is dissolved in ethyl acetate, washed with water and dried over potassium carbonate. After the addition of ethereal hydrochloric acid, the reaction product precipitates in the form of white needles. Thus, the dihydrochloride of the 3-n-butyl-4-methyl-7-{ 8-[4-('y-hydroxy propyl) piperazino[1']]-ethoxy}coumarin is obtained having a melting point of 251-253 Yield: 32 g.=*67.4% of the theoretical.

Analogously, the intermediates of the following general formula can be prepared:

Analogously to the description given in the 1st paragraph of the present example, the following compounds of the present invention can be prepared from the beforementioned intermediates:

EXAMPLE2 (I311: (EH30 CH O CO O CH N N H O si -24\ /(C 2)a- 44.5 g. (0.1 mol) 3-B-diethylamino-ethyl-4-methyl-7- {'y- [4' (fl-hydroxy-ethyl)-piperazino[1]]-propoxy}-coumarin are dissolved in 500 cc. anhydrous ethyl acetate and 10.1 g. (0.1 mol) triethylamine are added. Within one hour, 23 g. (0.1 mol) 3,4,5-trimethoxybenzoyl chloride dissolved in 100 cc. anhydrous ethyl acetate are added dropwise with stirring. Then, stirring is continued for hours at room temperature, then for 2 hours under reflux. After cooling down, the solution is admixed with water, the ethyl acetate layer is separated and Washed with water, a 5% aqueous sodium hydrogen carbonate solution and again with water. After the ethyl acetate solution has been dried over anhydrous sodium sulfate, anhydrous hydrogen chloride is introduced with ice-cooling, until the precipitation is completed. Thus, the trihydrochloride of the 3 fl diethylamino-ethyl-4-methyl-7-{y-[4'-(B-3",4", 5"-trimethoxybenzoxyethyl) piperazino[1'] ]-propoxy}- coumarin is obtained in the form of colorless crystals decomposing at 142.

Yield: 54 g.=72% of the theoretical.

The 3 [3 diethylamino-ethyl-4-methyl-7-{'y-[4-({3- hydroxy-ethyl) piperazino[1]]-pr0poxy}-coumarin required as starting material can be prepared as follows:

(a) 31.15 g. (0.1 mol) 3 ,8 diethylamino-ethyl-4- methyl-7-hydroxy-coumarin hydrochloride are dissolved in 150 cc. dimethyl sulfoxide, 11.2 g. (0.1 mol) potassiumtertiary-butylate are added and the solution is stirred at 40-50 for 30 minutes. Then 17.3 g. (0.11 mol) l-bromo- 3-chloro propane are added dropwise with stirring. Subsequently, the reaction mixture is stirred at 40 for hours and, after cooling down, it is poured in five times its volume of Water. For purification purposes, the crude product precipitating in the form of an oil is dissolved in ethyl acetate. The ethyl acetate solution is washed with a dilute caustic soda solution, dried over potassium carbonate and evaporated to dryness under reduced pressure. The residue is recrystallized from petroleum ether. Thus, the 3 ,8 diethylamino-ethyl-4-methyl-7-'y-chloro-propoxy-coumarin is obtained in the form of colorless crystals melting at 59-61.

Yield: 19 g.=54% of the theoretical.

Analogously, the following products are prepared:

Melting point, 3 n butyl-4-methyl-7-y-chloro-propoxy-coumarin 55-57 3 n butyl-4-n-propy1-7-'y-ch10rO-prOpOXy-c0umarin 56-58 3 ethyl 4 phenyl-7-'y-chloro-propoxy-coumarin -86 3 allyl 4 methyl-7- -chloro-propoxy-coumarin 39-41 3 ,8 piperidino-ethyl-4-n-propyl-7- -chloropropoxy-coumarin hydrochloride 218-219 (b) 35.1 g. (0.1 mol) 3-,8-diethylamino-ethyl-4-methyl- 7-'y-chloro-propoxy-coumarin and 13 g. (0.1 mol) N-(B- hydroxy-ethyl)piperazine are dissolved in 180 cc. chloro benzene, 10.6 g. (0.1 mol) anhydrous sodium carbonate are added and the reaction mixture is stirred at 120 for 12 hours. After cooling down, the reaction mixture is filtered 011 with suction from separated sodium chloride and the filtrate is evaporated to dryness in the vacuum. The resulting residue is recrystallized from diethyl ether for purification. Thus, 313-diethy1amino-ethyl-4-methyl-7- {'y- [4-( 3-hydroxy-ethyl) piperazino[1'] ]-propoxy}-coumarin is obtained having a melting point of 70-71.

Yield: 31 g.=69.7% of the theoretical.

Analogously, the following intermediates can be prepared:

Footnotes at end of table.

TABLE-Continued R1 B2 A2 Melting Point of the trihydrochloride, chromium-0H? CH3 OH2-CH(0H 234-236 H N-CHz-CHr- 11-0 117 -GH3CH2- 250-254 Same as above 11-05111 -CH2CHzCH2- D0 n-G H -OH2--CH2-CH2CH2 1 With decomp. 2 Starting from 60 with decomp. Starting from 135 with deeomp.

Analogously to the description given in the 1st paragraph of the present example, the following compounds under the present invention can be prepared:

action mixture is stirred at 40-50 for another 2 hours. After cooling down, it is admixed with water, the chloroform phase is separated and washed with water, a 5% Melting Point of the trihydro- R1 R2 A1 (Ra)m chloride,

OZHB) Z-N-OZH4 CH3 0 Ha -C Hz-C H2- 3,4, 5(0 CH3) 3 1 120 EOgHsM'N-C2H4 0H -CHz-CH(CH 3, 1,5(OCH3); i 130 H /NCHz-OH n-OaH GHz-CH 3, 1,5 003 I 1211 Same as above n-O3H 0Hr-GH2OH2 3,4,5(OCH 1 115 D 11-03111 -CHz-CH2-OH2CHz 3,4,5(O CH3); 1 120 Melting Point of the dihydrochloride,

11-0111, CH OH -CH -OH 3,4,5(OOH 211-216 1 -04119 CH 'CH2 0H(OH3) 3,4,5(OCH 1 152 n-OiHo 0H3 -0H20H2-0H2-0H 3,4,5(o CH 228-230 D' iHD 11-03111 HzC 2- 3,4,5(OCH3)3 209-211 I /4H9 n-OaH- --CHz-CHz-CHz- 3,4,5(0CH3)3 200-202 44.6 g.' (0.1 mol) 3 n-buty1-4-n-propyl-7-{-y-[4'45- hydroxy-ethyl)-piperazino[1']] p hydroxy-propoxy}- coumarin are dissolved in 300 cc. anhydrous chloroform and 10.1 g. (0.111101) triethylamine are added. Within 1 hour, 23 g. (0.1 mol) 3,4,5-trimethoxybenzoyl chloride dissolved in 100 cc. anhydrous chloroform are added dropwise with stirring.

sodium hydrogen carbonate solution and again with water. The chloroform solution is dried over anhydrous sodium sulfate, the solvent is then distilled off at 50 in the waterjet-vacuum and the residue is dissolved in dilute aqueous hydrochloric acid. For purification, the aqueous hydrochloric solution is washed with ethyl acetate, then rendered alkaline with potassium carbonate (pH 9). The reaction After the exothermic reaction has decayed, the reproduct which has precipitated in the form of an oil is extracted with ethyl acetate. The ethyl acetate solution is dried over anhydrous sodium sulfate, freed from the solvent under reduced pressure and the residue is dissolved in about 100 cc. anhydrous methanol. By adding methanolic hydrochloric acid, the dihydrochloride of the 3 n butyl-4-n-propyl-7-{ -[4'-(,3-3",4",5"-trimethoxybenzoxyethyl)-piperazino[1']] ,8 hydroxy-propoxy}- coumarin in the form of colorless crystals decomposing at 235 is obtained.

Yield: 50 g.=70% of the theoretical.

The 3 n butyl-4-n-propyl-7-{v-[4-(,3-hydroxy-ethyl)- piperazino[1']] B -hydroxy-propoxy}-coumarin required as starting material can be prepared as follows:

(a) 26 g. (0.1 mol) 3-n-butyl-4-n-propyl-7-hydroxycoumarin are dissolved in 150 cc. dimethyl formamide, 11.2 g. (0.1 mol) potassium-tertiary-butylate are added and the solution is stirred at room temperature for 30 minutes. With stirring, 46.3 g. (0.5 mol) epichlorohydrin are run at once into the solution. After hours stirring at room temperature, the reaction mixture is poured into water. The reaction product separating first in the form of an oil, is dissolved in ethyl acetate and the mixture is washed with dilute caustic soda solution. After having dried the ethyl acetate layer over potassium carbonate, it is evaporated to dryness under reduced pressure. For purification purposes the residue is recrystallized from petroleum ether. The 3-n-butyl-4-n-propyl-7-(2',3'-epoxypropoxy)-coumarin is obtained in the form of colorless crystal needles melting at l02-103.

Yield: 23 g.=73% of the theoretical.

Analogously, the following compounds can be prepared:

' Melting point, 4-methyl-7-(2',3-epoxy-propoxy)-coumarin 119-122 4-phenyl-7-(2',3'-epoxy-propoxy)-coumarin 121-122 3-n-butyl-4-methyl-7- 2,3'-epoxy-propoxy coumarin 104-105 3-ethyl-4-phenyl-7-(2',3'-epoxy-propoxy)- coumarin 3-allyl-4-methyl-7-(2,3'-epoxy-propoxy)- coumarin 125-127 3-fl-diethylamino-ethyl-4-methyl-7-(2',3'-epoxypropoxy)-coumarin 3-fl-piperidino-ethyl-4'n-propyl-7-(2,3'-epoxypropoxy)-coumarin 83-86 (h) 31.6 g. (0.1 mol) 3-n-butyl-4-n-propyl-7-(2',3- epoxy-propoxy)-coumarin are dissolved in 200 cc. ethanol, 39 g. (0.3 mol) N-(fl-hydroxy-ethyl) piperazine are added and the mixture is boiled under reflux for 10 hours. The reaction mixture is then concentrated in the water-jet vacuum and the remaining excess N-(fl-hydroxyethyl) piperazine is disilled off in the oil pump vacuum. The resulting residue is dissolved in little ethyl acetate. After having allowed the solution to stand for a while, the reaction production crystallizes out in the form of colorless needles. The 3-n-butyl-4-n-propyl-7-{'y-[4'-(}3 hydroxy ethyl) piperazino[l']] p hydroxy propoxy}-coumarin melting at 90-92 is obtained.

The intermediates having the following general formula can be prepared analogously:

CHaO

OCH:

44.6 g. (0.1 mol) 3-n-butyl-4-n-propyl-7-{ -[4'(p-hydroxy-ethy1)-piperazino[l]]- 3-hydroxy propoxy} coumarin are dissolved in 350 cc. anhydrous chloroform and 20.2 g. (0.2 mol) triethylamine are added. Within 2 hours, 46 g. (0.2 mol) 3,4,5-trimethoxybenzoyl chloride,

OCHa

coumarin is obtained in the form of colorless crystals decomposing at 227 Yield: 51 g.=70% of the theoretical.

The same product is obtained by the reaction of 1 3,4,5'-trimethoxy-benzoxypropyl)-4-('y-chloro 13 hydissolved in 200 cc. anhydrous chloroform, are added droxypropyD-piperazine, its dihydrochloride decomposing dropwise with stirring. After the exothermic reaction has decayed, stirring is continued at 40-50 for 2 hours, then the reaction mixture is worked up as described in Example 3.

at 159", with 3-n-butyl-4-n-propyl-7-hydroxy-coumarin melting at 118.

The 3-n-butyl-4-n-propyl 7 ('y-piperazine[1 ]-p-hydroxy-propoxy)-coumarin used in the present example as Thus, the dihydrochloride of the diester having the starting material can be prepared as follows:

above-mentioned formula is obtained in the form of colorless crystals decomposing at 160.

Yield: 70 g.=78.5% of the theoretical.

The above diester is also obtained by reacting in 86 g. (1 mol) anhydrous, distilled piperazine are dissolved in 150 cc. chloro benzene and heated to 120. A solution of 31.6 g. (0.1 mol) 3-n-butyl-4-n-propyl-7-(2', 3'-epoxy-propoxy)-coumarin in 200 cc. chloro benzene is chloroform the monoester described-in Example 3 with slowly added dropwise with stirring. Stirring is continued 3,4,5-trimethoxybenzoyl chloride, with the addition of triethylamine.

at 120 for 12 hours. After cooling down, separated piperazine is filtered 01f with suction from the reaction EXAMPLE 5 mixture and the filtrate is evaporated to dryness under CaH7 OHaO 04H OHaO C O-0-CHzCH2CH2-N N-CHz-(FH-OHr-O O 40.2 g. (0.1 mol) 3-n-butyl-4-n-propyl-7-{-y-piperazino [1']-,3-l1ydroxy-propoxy}-coumarin are dissolved in 100 cc. anhydrous chloro benzene, 13.8 g. (0.1 mol) potasreduced pressure. Residual and negligible quantities of excess piperazine are distilled oif in the oil pump vacuum. The residue is dissolved in methylene chloride, the solusium carbonate are added and, with stirring, a solution of tion is washed with little water, dried and slightly con- 29 g. (0.1mol) 'y-chloro-propyl 3,4,5,-timethoxy benzoate in cc. anhydrous chloro benzene are added dropwise at '50-60 within one hour. The reaction mixture is stirred for 12 hours with heating under reflux. Then, while hot,

the insolute is filtered 01f and, the filtrate is freed from 50 the solvent in the water-jet vacuum. After further working up as described in Example 3, the dihydrochloride of the 3-n-butyl-4-n-propyl-7-{y-[4'-('y-3",4",5"-trimethoxybenzoxypropyl) piperazino[1]] p -hydroxy-propoxy}- centrated. After having allowed the mixture to stand for a while, the 3-n-butyl-4-n propyl-7-(y-piperazino[1'1-5- hydroxy-propoxy)-coumarin crystallizes out in the form of colorless needles melting at 78 Yield: 22 g: 54.7% of the theoretical.

Analogously to the description given in Examples 3 and 4 as well as in the present example, the following compounds can be prepared according to the present invention:

TABLE-Continued Melting or point of the decomposition (liliydro- R1 R2 2 Y chloride,

CH3 H on, -o-oo--oo1n cnzoin- 170 l CH H CH3 Same as above -CH(CH3)CH: 164 H -CH2CH2 140 H CH2CH2CH2- 144 H -CH (CH -C.Hz

H-ClHQ -CH2CHz- 130 11-C4Hn CH (ClI )CHz n'ctHo CH2-CH2CII2CHz- 9B n-C4Ho CH2-C HzCHg 150 C H5 CH CH 130 C2115 -CH2'CH CH 133 11 -CH(CH )CH 124 CH =CHCH2- CHzCHz CHz=CHCH2 CH2-CH CH 143 CIIFCH-CHF CH(CH )-CHg- 145 Melting point; 0! the trihydrochlorido,

(C2H5) gNCH2CHz -CHZCH2 130 (C2H5)2NCH2CH2 CH2CH2CH;- 132 (CzHs) zNCHzCH2- CH (CH3)CH2 138 (C2H5) 2NCH2CH2- CH2CH2CH2CHz 131 H NCH2--CHz D-CsH'! -.d0 -C 2CH2 148 Same as above n-C3H1 do CHOH CI-I Melting point of the dihydrochloride,

n-C Hg Il-CaHr .dO CH(CH3) CH2 149 n-C H lit-C3111 .d0 CI'I2CH2CH2-CH2- 154 What is claimed is: 1. A coumarin derivative bearing having the formula wherein R stands for hydrogen, lower alkyl, allyl, dialkylaminoalkyl where the alkyl contains 1-4 carbon atoms, and whereby the alkyl groups attached to the nitrogen may form a piperidine ring, R stands for hydrogen, lower alkyl or phenyl, R stands for lower alkoxy where the alkyl contains 1-4 carbon atoms, m represents the integers 1, 2 or 3, and A and A are straight or branched alkylene residues having 2-4 carbon atoms, and Y is hydrogen, a hydroxy group or the residue or the hydrochloride of said coumarin derivative.

2. A coumarin derivative as set forth in claim 1 wherein R is selected from the group consisting of hydrogen, alkyl having 1-4 carbon atoms, allyl, diethylaminoethyl and piperidinoethyl, R stands for alkyl having 1-3 carbon atoms or phenyl, R stands for methoxy in 3, 4, 5- position,

is ethylene or propylene, and A is ethylene, n-propylene, isopropylene or n-butylene, or the hydrochloride of said coumarin derivative.

3. A coumarin derivative as set forth in claim 1 wherein R is selected from the group consisting of hydrogen, alkyl having 1-4 carbon atoms, allyl, diethylaminoethyl 0r piperidinoethyl, R stands for alkyl having l-3 carbon atoms or phenyl, R stands for methoxy in 3, 4, 5-position,

HaCO OCH:

OCHa and A is ethylene, n-propylene, isopropylene or n-butylene, or the hydrochlorides of said coumarin derivatives.

5. 4 methyl 7 {B-[4'-('y-3",4",5" trimethoxybenzoxypropyl)-piperazino[1]]-ethoxy} coumarin, or the hydrochloride of said coumarin derivative.

17 18 6. 4-methyl 7 {,3-[4'-(,8-3",4",5" trimethoxybenz- 4",5"-trimethoxybenzoxypropoxy}-c0umarin, or the hyoxypropyl)-piperazino[1']]-ethoxy}-coumarin, or the hydrochloride of said coumarin derivative. drochloride of said coumarin derivative.

7. 3 ethyl-4-phenyl-7-{'y-[4'-( 8-3",4",5"-trimethoxy- References Cited benzoxyethyl) piperazino[1]]-propoxy}-coumarin, or the hydrochloride of said cournarin derivative. b 8. 3-ally11 I; 4-methy1-7-{v-[4-(B-g,4",5-trimetgoxy- ALEX MAZEL, Primary Examiner enzoxyet y -piperazino [1]]-;3- ,4",5"-trimet oxybenz0xypropoxy}-coumarin, or the hydrochloride of said RUSH Assistant Exammer coumarin derivative. 1

9. 3 B N-piperidinoethy1-4-n-propy1-7-{'y-[4'-(B-3", US 4",5" trimethoxybenzoxyethyl)-piperazino[1']1 ,8-3", 260*343-21424250 5 Morrison et 211.; Organic Chemistry, 1959, p. 483. 

